How to Get a Color Value from App.xaml in a Page

I have declared a color that I will be using a lot in my application, and I would like to be able to call that specific color within a page. This color will most likely be used in in XAML as well as code behind. In App.xaml I have ``` <Color x:Name="Blue" A="255" R="35" G="85" B="145"/> ``` But how would I call this in my Page's UI and code behind? Actually to note, the above setting a color in App.xaml gives a debugging error on startup? ``` public App() { // Standard XAML initialization InitializeComponent(); //XamlParseException occurs here ... } ``` EDIT** Update for SolidColorBrush not working I have a Slider control and two ToggleSwitch controls declared in XAML, and I wish to change the Slider foreground in XAML and change the ToggleSwitch controls in code behind. Neither is working App.xaml ``` <Color x:Key="ThemeColorBlue" A="255" R="35" G="85" B="145"/> <SolidColorBrush x:Key="ThemeBrushBlue" Color="{StaticResource ThemeColorBlue}"/> ``` and so when attempting to change the Slider control foreground in XAML I get no errors using ``` Foreground="{StaticResource ThemeBrushBlue}" ``` but when changing the ToggleSwitch foreground in code behind I get an error stating `Cannot implicitly convert type 'object' to 'System.Windows.Media.Brush'` ``` this.ToggleSwitch.SwitchForeground = Application.Current.Resources["ThemeBrushBlue"]; ```